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btrfs: sysfs: document structures and their associated files
Sysfs file has grown big. It takes some time to locate the correct struct attribute to add new files. Create a table and map the struct attribute to its sysfs path. Also, fix the comment about the debug sysfs path. And add the comments to the attributes instead of attribute group, where sysfs file names are defined. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain
David Sterba
parent
e4571b8c5e
commit
e7849e33cf
@ -22,6 +22,26 @@
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#include "block-group.h"
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#include "qgroup.h"
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/*
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* Structure name Path
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* --------------------------------------------------------------------------
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* btrfs_supported_static_feature_attrs /sys/fs/btrfs/features
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* btrfs_supported_feature_attrs /sys/fs/btrfs/features and
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* /sys/fs/btrfs/<uuid>/features
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* btrfs_attrs /sys/fs/btrfs/<uuid>
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* devid_attrs /sys/fs/btrfs/<uuid>/devinfo/<devid>
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* allocation_attrs /sys/fs/btrfs/<uuid>/allocation
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* qgroup_attrs /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>
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* space_info_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>
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* raid_attrs /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>
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*
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* When built with BTRFS_CONFIG_DEBUG:
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*
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* btrfs_debug_feature_attrs /sys/fs/btrfs/debug
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* btrfs_debug_mount_attrs /sys/fs/btrfs/<uuid>/debug
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* discard_debug_attrs /sys/fs/btrfs/<uuid>/debug/discard
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*/
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struct btrfs_feature_attr {
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struct kobj_attribute kobj_attr;
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enum btrfs_feature_set feature_set;
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@ -271,6 +291,13 @@ BTRFS_FEAT_ATTR_INCOMPAT(zoned, ZONED);
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BTRFS_FEAT_ATTR_COMPAT_RO(verity, VERITY);
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#endif
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/*
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* Features which depend on feature bits and may differ between each fs.
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*
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* /sys/fs/btrfs/features - all available features implemeted by this version
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* /sys/fs/btrfs/UUID/features - features of the fs which are enabled or
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* can be changed on a mounted filesystem.
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*/
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static struct attribute *btrfs_supported_feature_attrs[] = {
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BTRFS_FEAT_ATTR_PTR(mixed_backref),
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BTRFS_FEAT_ATTR_PTR(default_subvol),
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@ -294,13 +321,6 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
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NULL
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};
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/*
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* Features which depend on feature bits and may differ between each fs.
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*
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* /sys/fs/btrfs/features lists all available features of this kernel while
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* /sys/fs/btrfs/UUID/features shows features of the fs which are enabled or
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* can be changed online.
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*/
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static const struct attribute_group btrfs_feature_attr_group = {
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.name = "features",
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.is_visible = btrfs_feature_visible,
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@ -384,6 +404,12 @@ static ssize_t supported_sectorsizes_show(struct kobject *kobj,
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BTRFS_ATTR(static_feature, supported_sectorsizes,
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supported_sectorsizes_show);
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/*
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* Features which only depend on kernel version.
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*
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* These are listed in /sys/fs/btrfs/features along with
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* btrfs_supported_feature_attrs.
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*/
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static struct attribute *btrfs_supported_static_feature_attrs[] = {
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BTRFS_ATTR_PTR(static_feature, rmdir_subvol),
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BTRFS_ATTR_PTR(static_feature, supported_checksums),
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@ -393,12 +419,6 @@ static struct attribute *btrfs_supported_static_feature_attrs[] = {
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NULL
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};
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/*
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* Features which only depend on kernel version.
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*
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* These are listed in /sys/fs/btrfs/features along with
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* btrfs_feature_attr_group
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*/
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static const struct attribute_group btrfs_static_feature_attr_group = {
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.name = "features",
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.attrs = btrfs_supported_static_feature_attrs,
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@ -557,6 +577,11 @@ static ssize_t btrfs_discard_max_discard_size_store(struct kobject *kobj,
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BTRFS_ATTR_RW(discard, max_discard_size, btrfs_discard_max_discard_size_show,
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btrfs_discard_max_discard_size_store);
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/*
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* Per-filesystem debugging of discard (when mounted with discard=async).
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*
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* Path: /sys/fs/btrfs/<uuid>/debug/discard/
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*/
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static const struct attribute *discard_debug_attrs[] = {
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BTRFS_ATTR_PTR(discard, discardable_bytes),
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BTRFS_ATTR_PTR(discard, discardable_extents),
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@ -570,15 +595,19 @@ static const struct attribute *discard_debug_attrs[] = {
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};
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/*
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* Runtime debugging exported via sysfs
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* Per-filesystem runtime debugging exported via sysfs.
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*
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* /sys/fs/btrfs/debug - applies to module or all filesystems
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* /sys/fs/btrfs/UUID - applies only to the given filesystem
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* Path: /sys/fs/btrfs/UUID/debug/
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*/
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static const struct attribute *btrfs_debug_mount_attrs[] = {
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NULL,
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};
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/*
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* Runtime debugging exported via sysfs, applies to all mounted filesystems.
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*
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* Path: /sys/fs/btrfs/debug
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*/
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static struct attribute *btrfs_debug_feature_attrs[] = {
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NULL
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};
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@ -647,6 +676,11 @@ static ssize_t raid_bytes_show(struct kobject *kobj,
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return scnprintf(buf, PAGE_SIZE, "%llu\n", val);
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}
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/*
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* Allocation information about block group profiles.
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*
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* Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/<bg-profile>/
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*/
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static struct attribute *raid_attrs[] = {
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BTRFS_ATTR_PTR(raid, total_bytes),
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BTRFS_ATTR_PTR(raid, used_bytes),
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@ -686,6 +720,11 @@ SPACE_INFO_ATTR(bytes_zone_unusable);
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SPACE_INFO_ATTR(disk_used);
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SPACE_INFO_ATTR(disk_total);
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/*
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* Allocation information about block group types.
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*
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* Path: /sys/fs/btrfs/<uuid>/allocation/<bg-type>/
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*/
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static struct attribute *space_info_attrs[] = {
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BTRFS_ATTR_PTR(space_info, flags),
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BTRFS_ATTR_PTR(space_info, total_bytes),
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@ -713,6 +752,11 @@ static struct kobj_type space_info_ktype = {
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.default_groups = space_info_groups,
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};
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/*
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* Allocation information about block groups.
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*
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* Path: /sys/fs/btrfs/<uuid>/allocation/
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*/
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static const struct attribute *allocation_attrs[] = {
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BTRFS_ATTR_PTR(allocation, global_rsv_reserved),
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BTRFS_ATTR_PTR(allocation, global_rsv_size),
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@ -1012,6 +1056,11 @@ static ssize_t btrfs_bg_reclaim_threshold_store(struct kobject *kobj,
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BTRFS_ATTR_RW(, bg_reclaim_threshold, btrfs_bg_reclaim_threshold_show,
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btrfs_bg_reclaim_threshold_store);
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/*
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* Per-filesystem information and stats.
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*
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* Path: /sys/fs/btrfs/<uuid>/
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*/
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static const struct attribute *btrfs_attrs[] = {
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BTRFS_ATTR_PTR(, label),
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BTRFS_ATTR_PTR(, nodesize),
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@ -1521,6 +1570,11 @@ static ssize_t btrfs_devinfo_error_stats_show(struct kobject *kobj,
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}
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BTRFS_ATTR(devid, error_stats, btrfs_devinfo_error_stats_show);
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/*
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* Information about one device.
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*
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* Path: /sys/fs/btrfs/<uuid>/devinfo/<devid>/
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*/
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static struct attribute *devid_attrs[] = {
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BTRFS_ATTR_PTR(devid, error_stats),
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BTRFS_ATTR_PTR(devid, in_fs_metadata),
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@ -1810,6 +1864,11 @@ QGROUP_RSV_ATTR(data, BTRFS_QGROUP_RSV_DATA);
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QGROUP_RSV_ATTR(meta_pertrans, BTRFS_QGROUP_RSV_META_PERTRANS);
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QGROUP_RSV_ATTR(meta_prealloc, BTRFS_QGROUP_RSV_META_PREALLOC);
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/*
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* Qgroup information.
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*
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* Path: /sys/fs/btrfs/<uuid>/qgroups/<level>_<qgroupid>/
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*/
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static struct attribute *qgroup_attrs[] = {
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BTRFS_ATTR_PTR(qgroup, referenced),
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BTRFS_ATTR_PTR(qgroup, exclusive),
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